| F.61 | Fault: gas valve control. | The electronics detect an electrical fault in the activation/supervision of the valve (coils shorted to ground or wiring). Check coil resistances, absence of leakages, and control voltage from the PCB; if not compliant, replace the valve. |
| F.62 | Error: gas valve disconnection controller. | Delayed or non-tight closure of the valve detected (gas flow despite closure command). Check that the valve closes without delay and is tight: inspect ionisation after shutdown and perform a tightness/manometer test; replace if not tight. |
| F.88 | Fault: gas valve. | The gas valve is not/poorly connected or has a short circuit in its harness. Check the multi-connector, wiring continuity, and coils; if the wiring is OK and the fault persists, replace the valve. |
| F.28 | Fault: unsuccessful ignition on start-up. | Among the possible causes is 'error in the gas valve', which prevents the correct opening/closing of the gas supply. Check connection pressure at the gas valve itself, opening signal from the PCB, and valve response (program P.01 and manometer). |
| F.27 | Safety shutdown: flame detection error (simulation). | A non-sealed solenoid/gas valve may allow gas to pass with the burner off and generate an implausible flame signal. Check the valve's tightness after closing (without ionisation current or leakage) using a leak test/manometer; replace if there is passage. |
